MAX3082ECPA+

Overview

The MAX3082ECPA+ is a half-duplex RS-485/RS-422 transceiver featuring one driver and one receiver in an 8-pin PDIP package. It operates on a single +5V supply (4.75V to 5.25V) with a typical quiescent current of 375µA. The device incorporates fail-safe circuitry that guarantees a logic-high receiver output when inputs are open or shorted. Its driver utilizes reduced slew-rate limiting, which minimizes electromagnetic interference and reflections, supporting error-free data transmission up to 115kbps. It provides ±15kV ESD protection on all I/O pins.

Feature Summary

• Fail-safe receiver design ensures a logic-high output state during bus idle conditions or input faults.
• Slew-rate-limited driver operation reduces signal reflections and electromagnetic emissions for reliable communication.
• Integrated electrostatic discharge protection safeguards the interface against high-voltage static events.

Applications

• RS-422 and RS-485 serial communication networks
• Industrial control local area networks
• EMI-sensitive application environments

Procurement Notes

Verify the specific suffix 'CPA+' corresponds to the PDIP-8 package and commercial temperature range (0°C to +70°C). Confirm the 'E' designation indicates the extended industrial temperature range (-40°C to +85°C) if required by the system environment. Ensure the component matches the official Analog Devices / Maxim Integrated datasheet specifications before integration.

Selection Notes

Select this component for applications requiring half-duplex communication with inherent noise immunity. The built-in fail-safe feature eliminates the need for external pull-up resistors on the bus lines. The reduced slew rate makes it suitable for longer cable runs where signal integrity is critical at lower data rates.

Part Context

This device belongs to the MAX3080E–MAX3089E family of high-speed transceivers. It shares pin compatibility with industry-standard parts like the 75180 but includes enhanced features such as integrated ESD protection and fail-safe logic. The MAX3082E variant specifically defines the half-duplex configuration within this series.

Replacement Considerations

The MAX3082ECPA+ is pin-compatible with the standard 75180 transceiver. Designers should verify that the replacement supports the required ±15kV ESD protection level and fail-safe threshold characteristics specified in the original design constraints.

FAQ

How does the MAX3082E handle an open or shorted bus?

The device features fail-safe circuitry that guarantees a logic-high receiver output whenever the differential receiver inputs are open, shorted, or connected to a terminated line with all drivers disabled.

What determines the maximum data rate for this transceiver?

The MAX3082E utilizes reduced slew-rate drivers designed to minimize EMI and reflections, allowing for error-free data transmission up to 115kbps.

Is external termination required for the fail-safe feature?

No, the internal fail-safe thresholds ensure a logic-high output without external components when the bus is idle or disconnected, unlike older designs that required pull-up resistors.